Method and apparatus for blowing glass parisons



July 121 Y a. z. HOWARD METHOD AND APPARATUS FOR BLOWING GLASS PARISONS Filed Sept. 29. 19251 p/////////w/ W xh I J r I I I I llrllllllrllllllllllll I A Imam? t 01" G60? Patented July 12, 1927,

UNITED STATES PATENT' ounce;

GEORGE E. HOWARD, 0F BUTLER, PENNSYLVANIA, ASSIGNOR TO HiABTFOBD-EIPIBE COMPANY, 01 HARTFORD, CONNECTICUT, A CORPORATION OF DELAWARE.

METHOD AND APPARATUS FOR BLOWING GLASS PABISONS.

Appmxation filed September 29, 1925. Serial No. 59,277. Y

My invention relates to the manufacture of parisons for bottles and other hollowv glassware, and its general object is to provide a novel and efficient arrangement for accurately counter-blowing such parisons without the use of the bafiie plate or bottom plate which is ordinarily employed for limiting the elongation of the glass in the parison mold.

Briefly stated, my invention contemplates depositing a charge of glass in a parison mold, settling the glass in the mold by ordinary means, then counter-blowing by air pressure while leaving the charging end of the mold 0 en, and limiting the extent to which the g ass may elongate in the mold by causing the expanding glass itself to automatically cut off the supply of counter-blowlng air pressure.

In the ordinary system of,making narrowneck bottles and various other kinds of hollow glassware by the parison system, it is customary to settle the charge of glass in the parison mold' by air pressure applied to the charging end of the mold so as to produce the finish at the neck of the .bottle, and to produce an initial opening at the finish end, after Which air pressure is applied to the finish end of the mold and expands the glass to fill the mold. My present invention is concerned with the last of these steps. Ordiuarily, the charging end of the mold is closed by a bafiie or bottom plate prior to the counter-blowing operation, in order to confine the glass and limit its elongation.-

Attempts have been made to produce arisons without the use of baflie plates to imit the elongation of the blank during counterblowing, but such attempts have not been successful, or have been successful to a limited extent only, because when a blank is cbunter-blown without a baffle plate it is difficult to control the final length of the blank. The air, even if constant in pressure, is expansible, and the blank, being composed of viscous glass, resists the air pressure in varying degrees, depending upon the skin tension of the glass and upon the particular manner in which the mold charge has entered the, mold. Mold charges falling into blank molds do not fall into place exactly'alike. A small difference in the uniformity of the charges causes the shears to deflect the charges more or less at the instant of severing so that the charges drop difl'erently, some entering the mold evenly and establishin contact with the mold sides almost instant y over the entire side surface of the charge, while other charges may enter the mold somewhat un evenly, requiring an interval of settling before all parts of the mold charge come into proper contact withthe mold. Thus, two mold charges of identical weight, fed from the same feeder into the same mold, may difi'er in the resistance which they offer to elongation. Therefore, if no bottom plate or baflle plate is-provided on the .parison mold, blanks of different length are likely to be produced, even though the air pressure is applied in exactly the same manner to the successive molds. J

According to mly present invention, I cause the glass itse f, while being expanded in the parison mold, to cut ofi' the counterblowing air pressure by its position'in the parison mold when it reaches the desired elongation. Therefore, the blanks produced according to' my invention will be of equal length, even though they may differ slightly tion, reference may now be had to the ac if companying drawing, in which:

Figure 1 is a vertical sectional view taken centrally through a mold and associated apparatus constructed in accordance with my invention; and f Fig. 2' is a similar central section showing a modified construction. The structural features of the drawing are shown somewhat diagrammatically.

In Fig. 1 the numeral 2 indicates the body portion of a parison moldsuitable for use in the manufacture of narrow-neck bottles, and the numeral 3 indicates the usual neck ring associated with the body mold 2- The neck ring 3 is provided with a central opening through which the usual neck plunger 4 is adapted to enter the molding cavity. Above the open upper end of the mold, at the counterblowing position, is a blowhead 5 having a central et opening 6 and a number of inclined jet openings 7 disposed in a circle and directing air jets outwardly and downwardly. The air jets from the openings 7 are re ceived in channels 8 formed in the body r tion 2 of the mold, these channels exten g downward to communicate with other 1) Ma hanu In M;

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" are ymrfmmmi 1.15 in the apparatus neck plmwcr being removed no mum is 0115 i'm the position m: 'f'mmhw Tim 21's; at this H 119 upper pmimn of the mold 1111::- G'. If in irmL n. pufinf may ha immrlm mm Um mom ""mm 95 9 in HM: expansicn 0f 4:" mbel' E30 and he pipe 161': an 1 nhwhcafi E mk nnh'i Hm bottom of the blank so 10 midway point, usiim' instance Tim? 9101; J1] 01? the blank 01' initimmfi if the Mowhcnd 1W thin; (2min w 52:11:

. "m :26, winch (thaw 11m e'inngmt a: mrmmafi .i y mu; 0H and H10 blmvhes'a i3]. is :zTloweai t0 flnrough the chmwmh; 5&5. Meam (ha .151 from! the CL. "I'll spelling 23, fimf, hasa ephcct upon ass, m

ni. concavity l. in. the ed in humming; the at 03% (the ghl: Ummby tending 110 @0111 w a: Hm downward pmwmm'ce of Hm mix in- Hm uppm and m the mnld. "m 2 jPih innie h: Hill Hm and Hi. m iii 1n Um npp iuf. npxe'mii 'm .3 ,0 m am? dwcrihw i rw zaaw pmpcl" Nth merit of the parts may he made without demold with glass, compacting the gass inthe .parison mold by pressure applied through the open end of said mold, counterblowing the glass in said mold by air pressure applied at one end of said mold while leaving the opposite end of said mold 0 n, and causing the displacemen pqf said g ass in said mold to automatically stop the said expansion when said ex ansion has proceededto a predetermine extent.

2. Apparatus for making blown glass parisons, comprising a mold, means for applying air under pressure to the charging end of said mold, and means for conducting' air from the charging end to the opposite end of said mold and for causing said air to expand glass in said mold toward the charging end thereof.

3. Apparatus for making blown glass parisons, comprising a mold, means for applying air under pressure to the charging end of said mold, and channels for conducting air from the charging end to the o posite end of said mold, the inlets of said c annelsbeing so disposed that the elongation of the glass in said mold toward the charging end thereof automatically interrupts the entry of air pressure into said inlets.

iii

4. Apparatus for making blown lass parisons, comprising a mold, a blow read adapted to discharge diverging jets of air under pressure adjacent to the charging end of said mold, and channels for receiving said air jets and conducting the air under ressure into the opposite end of said mol the inlets of said channels being so disposed that the elongation of the glass ,in said mold automatically interrupts the entry of air pressure into said inlets.

5. Apparatus for making glass parisons, comprising a mold, air boxes arranged'ahove and below said mold, pipes connecting said I air boxes, and a blowhead disposed in one of said air boxes for directing air jets into said mold and into said pipes, and an opening in the other air box communicating with the interior of said mold.

6. Apparatus for making glass parisons, comprising a mold, air boxes arranged above and below said mold, pipes connecting said air boxes, and a blowhead disposed in one of said air boxes for directing air jets into said mold and into said pipes, an opening in the other air box communicating with the interior of said mold, and a hlowhead adapted to introduce air into the last-named air box for initially elongating glass charges in said mold,

Signed at Butler, Pa., this 21st day of Sept, 1925.

enonon HOWARD. 

